Resolve LHCBGAUSS-1524 ".evtrarelb2lllbugfix"
Closes LHCBGAUSS-1524
I am currently unable to test this change with v53r0 of Gauss due to an issue with compiling the Fortran components of EvtGen locally (see https://its.cern.ch/jira/browse/LHCBGAUSS-1523).
Edited by John James Back